<h3>y =
Ответ</h3>
y = (11/9+2 1/4)x-3/4
11/9 = 1 2/9
(y +3/4)/x = 3 2/9 +1/4
x = 0.1
(y - 3/4)/0.1 = 3 8/36+ 9/36
(y - 3/4)*10=3 17/36
y10 - 30/4 = 3 17/36
y = (3 17/36 + 30/4)/10
дальше сам
1) 5
2) 126-6у
3)2; 77
4) 3; 16у
5) 4;75х
6)5; 35
X+0.42x+0.28x=6.8
x(1+0,7)=6.8
x=4